The engineers are looking into it, but it might be a safety function within the search engine to not include common words. For example, if someone searched for the word "and" imagine what it would do to the site finding all those hits. I don't know if the engine does have a list of non-searchable words for this purpose, or if we can edit such a list if it exists - but the engineers are working to find out what is possible. I just wanted to throw this in as a possible reason why 'under' ins't being found....that, or TFSE just plain sucks.